ToothGrowth data set contains the result from an experiment studying the effect of vitamin C on tooth growth in 60 Guinea pigs. Each animal received one of three dose levels of vitamin C (0.5, 1, and 2 mg/day)
for more info: https://stat.ethz.ch/R-manual/R-devel/library/datasets/html/ToothGrowth.html
The plot on next slide doesn't work on Firefox. Please use Google Chrome or Internet Explorer! Thank you!